| Rank | Precipitation | Month |
|---|---|---|
| 1 | 30.5 cm | July 2014 |
| 2 | 27.4 cm | August 1952 |
| 3 | 24.9 cm | July 1970 |
| 4 | 23.6 cm | September 1947 |
| 5 | 23.2 cm | October 1955 |
| 6 | 22.7 cm | August 1972 |
| 7 | 20.6 cm | August 1988 |
| 8 | 20.4 cm | September 1957 |
| 9 | 20.1 cm | July 1995 |
| 10 | 20.1 cm | October 2006 |
| 11 | 20.0 cm | June 1957 |
| 12 | 19.6 cm | June 2014 |
| 13 | 19.5 cm | September 2010 |
| 14 | 19.5 cm | May 1995 |
| 15 | 19.1 cm | September 1999 |
| 16 | 19.0 cm | October 2001 |
| 17 | 18.9 cm | September 1959 |
| 18 | 18.7 cm | September 1944 |
| 19 | 18.6 cm | August 1940 |
| 20 | 18.5 cm | September 2001 |